SOLID pocket guide for design pressure
Recall SOLID principles as practical questions to ask during design and review.
SOLID What does SOLID stand for in OOP design? Recall the five design questions. Acronym SRP: small class or one change reason? Compare Use class size to investigate; use independent change pressure to decide. Objection: 'Adding an interface for this gateway is overengineering.' The payment gateway has production, sandbox, and fake implementations. Your line I would skip an interface for a stable helper. Here the gateway varies by environment and test, so the abstraction protects a real seam. Do not defend interfaces in general; defend the specific volatility. DIP is useful when the abstraction corresponds to real variation. What is…
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